Developers made over $10 billion building apps for iOS in 2014, and they're likely to make even more cash in 2015. According to Apple, the first week of January set a new record for App Store revenue -- over half a billion dollars has been spent on apps and in-app purchases so far -- and New Year's Day 2015 saw the biggest number of apps sold in a single day ever.

Mobile apps are becoming increasingly refined: Where once an app performed numerous functions, now there are apps that focus on a single task. Here are 19 apps that will inspire you to embrace small screens and single-task applications.

The first formal collaboration between the two companies since Jeff Bezos bought The Washington Post for $250 million last year, the new Post app was designed to reduce the noise of the Web to something as streamlined as a print publication.

Experts speculate that Apple Pay's combination of Touch ID and NFC payments could potentially overcome consumer resistance to paying with a phone, making it a real possibility that Apple may have finally succeeded in making a phone a wallet.